. >>> there's a new battle in the patent war between samsu -- samsung and apple. the south korean tech company filed its own infringement against apple iphone 5. the two companies have a history of lawsuits targeting each other. just last month samsung was ordered to pay apple on another infringement case. >>> the dow dropped 32 point, the nasdaq gained six. one analyst said he doesn't expect any big knews until the monthly unemployment figures are released on friday. >>> now to the race for the white house, president obama and mitt romney are said to face off tomorrow night in the first of three presidential debates. crews put the finishing touches at the stage today of the university of denver. at the eve of a debate, a wall street journal poll shows the president keeping his gain but romney is close by. the moderator is jim lehrer host of news hour. president obama and governor romney will have two minutes for their answers. >>> and at 10:30 tonight, how the two candidates are getting ready. one visited the site of an engineering marvel he had never seen before